POLARBEAR (PB) was the first experiment deployed as part of this program and delivered in the last couple of years some of the most interesting results in the field. This single-telescope, single-frequency observatory operating with O(1000) high-sensitivity detectors is going to be progressively replaced by a more powerful Simons Array (SA), composed of three telescopes, observing in at least three frequency bands and furnished with roughly O(10,000) detectors.